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  1. // Copyright Kevlin Henney, 2000-2005.
  2. // Copyright Alexander Nasonov, 2006-2010.
  3. // Copyright Antony Polukhin, 2011-2014.
  4. //
  5. // Distributed under the Boost Software License, Version 1.0. (See
  6. // accompanying file LICENSE_1_0.txt or copy at
  7. // http://www.boost.org/LICENSE_1_0.txt)
  8. //
  9. // what:  lexical_cast custom keyword cast
  10. // who:   contributed by Kevlin Henney,
  11. //        enhanced with contributions from Terje Slettebo,
  12. //        with additional fixes and suggestions from Gennaro Prota,
  13. //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
  14. //        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
  15. //        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
  16. // when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
  17.  
  18. #ifndef BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
  19. #define BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
  20.  
  21. #include <boost/config.hpp>
  22. #ifdef BOOST_HAS_PRAGMA_ONCE
  23. #   pragma once
  24. #endif
  25.  
  26. #include <boost/mpl/bool.hpp>
  27. #include <boost/type_traits/is_same.hpp>
  28.  
  29. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  30.  
  31.     namespace detail // is_character<...>
  32.     {
  33.         // returns true, if T is one of the character types
  34.         template < typename T >
  35.         struct is_character
  36.         {
  37.             typedef BOOST_DEDUCED_TYPENAME mars_boost::mpl::bool_<
  38.                     mars_boost::is_same< T, char >::value ||
  39.                     #if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING)
  40.                         mars_boost::is_same< T, wchar_t >::value ||
  41.                     #endif
  42.                     #ifndef BOOST_NO_CXX11_CHAR16_T
  43.                         mars_boost::is_same< T, char16_t >::value ||
  44.                     #endif
  45.                     #ifndef BOOST_NO_CXX11_CHAR32_T
  46.                         mars_boost::is_same< T, char32_t >::value ||
  47.                     #endif
  48.                         mars_boost::is_same< T, unsigned char >::value ||
  49.                         mars_boost::is_same< T, signed char >::value
  50.             > type;
  51.  
  52.             BOOST_STATIC_CONSTANT(bool, value = (type::value) );
  53.         };
  54.     }
  55. }
  56.  
  57. #endif // BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
  58.  
  59.  
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